Door-bell.



M. ZIMMERMAN.

DOOR BELL.

APPLICATION FILED APR. 9, 1913.

Patented Nov. 25, 19-13;

wi lmaoow UNITED STATES PATENT OFFICE.

MARTIN ZIMMERMAN, OF EPI-IBATA, PENNSYLVANIA.

DOOR-IBELL Specification of Letters Patent.

Application filed April 9, 1913. Serial No. 760,037.

This invention relates to door bells and more particularly to doorknob operated bells.

The principal object of the invention is the provision of simple and eflicient mechanism which is actuated by pushing or sliding the knob shank through the lock to ring the bell.

A. further object of the invention is the provision of a device of this character having an operating device for the bell mechanism which is thrown to inoperative position upon turning the knob in either direction to actuate the lock or latch.

Still another object of the invention is the provision of simple and eflicient mechanism for actuating the clapper of the bell which will be durable and relatively cheap to manufacture.

A still further object of the invention is the provision of a device of this character which may be readily and conveniently applied to any door using a knob shank for actuating the latch.

Further objects of the invention will appear as the following description is read in connection with the accompanying drawing, which forms a part of this application, and in which 1- V Figure 1 is an inside elevation of the door showing the mechanism applied thereto. Fig. 2 is an edge elevation of the door. Fig. 3 is an enlarged detail elevation of the bell clapper mechanism with the bell removed. Fig. 4 is a top plan view thereof with the bell and bell post removed. Fig. 5 is an enlarged detail elevation showing the position of the parts when the knob shank is turned, and with the inner knob broken away so as to show the manner of connecting the trigger actuating segment.

Referring more particularly to the drawing, 1 represents a door in which is fitted an ordinary mortise lock 2 having a knob operating shank 8 passing therethrough and adapted to operate, in the usual manner, the latch bolt 4. In this instance the knob shank 3 is somewhat longer than ordinary and is provided, as is usual, with the removably attached knobs 5 between one of which and the rose plate is a spring 7 which normally holds the shank projected toward the outside of the door. Attached to the inner knob ferrule by means of the clamp 8 is a segment 9 whose upper edge is formed on a curve which makes the segment adapted to engage and actuate the bell mechanism only when the shank is in normal position and not turned in either direction to actuate the latch bolt 4.

Mounted above the escutcheon plate 10 of the lock on the inside of the door is a supporting plate 11 having a bell post 12 secured thereto and which in turn has the bell 13 mounted thereon. Projecting outwardly from the plate 11 is a pivot stud 14 upon which is journaled the clapper rod 15. This clapper rod is formed from a single strand of relatively heavy spring wire which is wrapped around the pivot post 14 and has its opposite end terminating in a double loop, the individual members of which are numbered 16 and 17. This coil of wire may be considered the hub of the clapper rod and is held in position upon the pivot stud by a right angularly bent arm 18 carried by the plate 11.

Connected to the loop 16 is a chain 19 whose opposite end is-connected to a hook 20 forming one leg of a bell crank lever 21 pivoted between the ears 22 upon the plate 11. The opposite leg of the bell crank lever is indicated at 23 and is provided with a beveled or sheared face 24 which the segment is adapted to wipe over upon its retro grade movement. The forward or inward movement of the segment when the knob shank is in normal position brings said segment into engagement with the end 23 of the bell crank consequently drawing downwardly upon the chain and turning the hub on the pivot stud and throwing the clapper to the opposite extreme of its movement against the tension of the spring 25. This spring 25 has one end coiled around the pivot stud 14 and its opposite end connected in the loop 17 the spring being in the form of a loop and held down against the plate by a clip finger 26. As the segment moves Patented Nov. 25, 1913. I

inwardly it will become disengaged from In order to limit the movement of the clapper and to prevent its constant contact- With the bell there is provided a stop 27 which engages the loop 17 and limits the rotary movement of the hub upon the pivot stud;

What I claim is 1. In a door bell, a supporting plate, a pivoted bell crank lever carried thereby, a slidably and: rotatably mounted lockoperating knob shank, means carried by the knob shank and adapted toactuate the bell crank lever only When the knob shank is in normal position relative to its rotation, resilient means for holding the knob shank against sliding movement, and bell striking mechanism actuated by the bell crank lever.

2. In a door bell, a supporting plate, a pivoted bell crank lever carried thereby, a

slidably and rotatably mounted lock-operat- 'ing knob shank, a curved segment carried by the knob shank and arranged in the path of the bellcrank lever only when the knob MARTIN ZI-MM'ERMAN. Vitnesses Mi L. IVEIDMAN, J. H. H-IBSHMAN.

Copies of this patent may be obtained for the cents each, by addressing the Commissioner of- Patents, Washington, D. 0. 

